Understanding Wccpv1 Configuration - Cisco 7609 Configuration Manual
Cisco ios software configuration guide—12.1e
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Chapter 35
Configuring Web Cache Services Using WCCP
•
A future release of Cisco Application and Content Networking System (ACNS) software (Release 4.2.2
Note
or later) supports the accelerated keyword with Release 12.1(13)E and later releases.
Understanding WCCPv1 Configuration
With WCCP-Version 1, only a single router services a cluster. In this scenario, this router is the device
that performs all the IP packet redirection.
Figure 35-1 Cisco Cache Engine Network Configuration Using WCCP-Version 1
Clients
Content is not duplicated on the cache engines. The benefit of using multiple caches is that you can scale
a caching solution by clustering multiple physical caches to appear as one logical cache.
The following sequence of events details how WCCPv1 configuration works:
1.
2.
3.
78-14064-04
Layer 2 redirection takes place on the PFC and is not visible to the MSFC. The show ip wccp
web-cache detail command on the MSFC displays statistics for only the first packet of a Layer 2
redirected flow, which provides an indication of how many flows, rather than packets, are using
Layer 2 redirection. Entering the show mls entries command displays the other packets in the Layer
2 redirected flows.
Internet
Router
Clients
Each cache engine is configured by the system administrator with the IP address of the control
router. Up to 32 cache engines can connect to a single control router.
The cache engines send their IP addresses to the control router using WCCP, indicating their
presence. Routers and cache engines communicate to each other via a control channel; this channel
is based on UDP port 2048.
This information is used by the control router to create a cluster view (a list of caches in the cluster).
This view is sent to each cache in the cluster, essentially making all the cache engines aware of each
other. A stable view is established after the membership of the cluster remains the same for a certain
amount of time.
Figure 35-1
illustrates how this configuration appears.
100BASE-T
Cache 1
Cache 2
Cache 3
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
Understanding WCCP
35-3
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